Light pollution in Ireland

9 cities · estimated Bortle class at each city centre

1 of 9 cities read Bortle 8–9 · 2 of 9 cities read Bortle 7–8 · 6 of 9 cities read Bortle 6–7. The darkest city centre on the list is Navan (Bortle 6–7).

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Cities, brightest first

#	City	Bortle (est.)	Brightness	2 classes darker
1	Dublin	8–9	255	~25 km E
2	Cork	7–8	255	~25 km SSE
3	Limerick	7–8	253	~25 km ENE
4	Waterford	6–7	254	~25 km S
5	Galway	6–7	255	~25 km WSW
6	Bray	6–7	172	~25 km ESE
7	Drogheda	6–7	252	~25 km ENE
8	Dundalk	6–7	192	~25 km ESE
9	Navan	6–7	234	~25 km WSW

Brightness is the NASA VIIRS Black Marble 2016 value at the city centre on a 0–255 scale; 255 is saturated. Cities are ordered by estimated sky brightness, which also counts the light within 30 km.